You need to reset the BIOS using a Jumper, just removing the battery wont work. Just do a search in the forum you will get lots of threads related to resetting the BIOS.
Yeah,he is right.Open your cabinet and you will find 2 pins near the ROM with "short" and "open" written near them.Just join them through a jumper(or even connecting them with a wire also works don't try this if you are not sure!!!) and turn on the computer.You will see the message "checksum error-Defaults loaded" and BIOS will reset.
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Dell Inspiron 1564
i3 330M 2.13GHz
4GB DDR3 1066MHz
ATI M.R. HD 5450 1GB
298 GiB 7200rpm WD hdd